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National Stock Number:
5306-01-447-3345
Federal Supply Class:
5306
National Item Identification Number:
014473345
Description:
BOLT,CLOSE TOLERANCE
Detail:
An externally threaded fastener whose unthreaded portion is of a specified grip length, plated or unplated, and is machined to a tolerance of one thousandth (0.001) of an inch (0.025 mm) or less of a specific diameter for items one inch (25 mm) or less in diameter. Items over one inch (25 mm) in diameter shall have a tolerance of fifteen ten-thousandths (0.0015) of an inch (0.038 mm) or less. The nominal major diameter of the threads shall be at least one thousandth (0.001) of an inch (0.025 mm) below the minimum shank diameter, but not below the minimum major diameter for applicable class of fit, as shown in the Screw Thread Standards, FED STD H28 and/or other nationally recognized standards. The head is not designed to be held or driven with an inserted driver, nor is it designed for rotation by the thumb and fingers. A locking feature may be incorporated in the design of the head or threads. For items having close tolerance, and fabricated from material having 160,000 pounds per square inch (1100 megapascals) minimum tensile strength, see BOLT, SHEAR. For items fabricated from material having less than 160,000 pounds per square inch (1100 megapascals) minimum tensile strength and not having a close tolerance, see BOLT, MACHINE.
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Manufacturer Information:
| M8906/2-4-7 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | M8906/2-4-7 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M | | MIL-B-8906 | 80205 | NATIONAL AEROSPACE STANDARDS COMMITTEE AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INC NOT FOR RFQ OR SOLICITATION USE | | MIL-B-8906 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| THREAD SERIES DESIGNATOR | UNJF | | NOMINAL THREAD DIAMETER | 0.250 INCHES | | THREAD QUANTITY PER INCH | 28 | | THREAD CLASS | 3A | | THREAD DIRECTION | RIGHT-HAND | | THREAD LENGTH | 0.397 INCHES MAXIMUM | | FASTENER LENGTH | 0.820 INCHES MINIMUM AND | | 0.840 INCHES MAXIMUM | | MATERIAL | STEEL COMP H11 OVERALL | | MATERIAL DOCUMENT AND CLASSIFICATION | AMS 6487 ASSN STD SINGLE MATERIAL RESPONSE OVERALL | | SURFACE TREATMENT | CADMIUM OVERALL | | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | MIL-C-8837 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL | | HARDNESS RATING | 46.0 ROCKWELL C MINIMUM AND | | 50.0 ROCKWELL C MAXIMUM OVERALL | | MINIMUM TENSILE STRENGTH | 132000 POUNDS PER SQUARE INCH | | HEAD STYLE | SPLINE DRIVE SHEAR HEAD | | HEAD HEIGHT | 0.164 INCHES NOMINAL | | HEAD MINOR DIAMETER | 0.447 INCHES MINIMUM | | GRIP LENGTH | 0.428 INCHES MINIMUM AND | | 0.448 INCHES MAXIMUM | | GRIP DIAMETER | 0.2485 INCHES MINIMUM AND | | 0.2495 INCHES MAXIMUM |
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